Ería is committed to the Diamond Open Access publishing system, ensuring free access to research results with maximum visibility for published works. This means that the journal provides unrestricted access to all its content from the moment of electronic publication. The entire editorial process, from peer review to publication, is funded by the University of Oviedo and sponsoring entities, and no fees are charged to authors or readers.

Works published in Ería are subject to the following terms:

1. The works are published in the journal's electronic edition under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 Spain license (legal text). They may be copied, used, disseminated, transmitted, and publicly displayed, provided that: i) the authorship and the original source of publication (journal, publisher, and URL of the work) are cited; ii) they are not used for commercial purposes; iii) they do not constitute a derivative work; iv) the existence and specifications of this license are mentioned.

2. Self-archiving conditions. Authors are authorized to self-archive their articles in their pre- and post-print versions (editorial versions) on personal or institutional websites, including a link to the journal's website and providing the full citation method for the work. Ería and its URL https://reunido.uniovi.es/index.php/RCG/index are the only authorized sources to correctly reference the editor's version in all article citations.

3. Ería's articles are preserved in the University of Oviedo (RUO) repository: https://digibuo.uniovi.es/dspace/page/visibility, as well as in Dulcinea https://dulcinea.opensciencespain.org/ficha1797

The authors also declare that they have respected the ethical principles of research and are free of any conflict of interest.